Delete row sig_6c456cefd03d from signals

id sig_6c456cefd03d
event_id evt_7bc197c0c7b3
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-20T15:42:12.812874+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:cdf311d15e910ee ...
throttle_s 0
created_at 2026-04-20T15:42:12.812874+00:00
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